I find this little water purifier intriguing. I'm also making the switch from plastic water bottles in the backcountry to the stainless steel Kleen Kanteens that I have been using at home for the past 4-5 years.

In watching Steripen's video demo though, I'm wondering if the narrow mouth (compared to the wide mouthed Nalgene in the video) of the Kleen Kanteen is wide enough to get the Steripen deep enough inside?

Assuming the Steripen fits, I'm also wondering if its lamp is strong enough to be tapping against the insides of the steel Kleen Kanteen? While in therory, the lamp wouldn't have to touch the bottles inside but with so little room in this case, I think it would be inevitable in such confines.

Any first hand input from Steripen users?

BTW. I'm aware of all my other purifying options so no need to suggest Aqua Mira or iodine tabs and such.:-)

Thanks.